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• flv : clarify use of video info/cmd frame.

  19 mars 2012, par Clément Bœsch

  flv : clarify use of video info/cmd frame.

• Does ffmpeg play the entire video file to extract image

  21 mars 2012, par user735647

  I have a multimedia application which involves lot of videos. I use FFMPEG to generate the thumbnails from the video at a particular time duration. Now the problem is my console application which is used to extract the images from the video is consuming lot of memory when its being run.

  The doubt I have now is whether FFMPEG does play the entire video file when extracting the thumbnail image.Is it possible ?

  Following is the parameter being passed to FFMPEG,

    -i [input video file] -an -r 0.05 -y -ss 00:00:18 -vframes 1 [output thumbnail file path]

  I tried googling but with no success. Please provide your valuable thoughts.

  Thanks.

• Fast video compression like Whatsapp

  5 août 2015, par Douglas Anunciação

  I need to speed up video compression in my Android app. I’m using FFMPEG and it takes 3 minutes to compress 80MB video. Does anyone knows a better solution ?

  The command I’m using is :

  /data/data/com.moymer/app_bin/ffmpeg -y -i /storage/emulated/0/DCIM/Camera/VID_20150803_164811363.mp4 -s 640x352 -r 25 -vcodec mpeg4 -ac 1 -preset ultrafast -strict -2 /storage/emulated/0/DCIM/Camera/compressed_video.mp4

  I’m running this command using FFMPEG for Android from this github repo : https://github.com/guardianproject/android-ffmpeg-java

  The code to use FFMPEG in my project is inside an AsyncTask and is copied below :

      @Override
  
      protected Object doInBackground(Object... params) {
  
  
  
          ItemRoloDeCamera compressedVideo = new ItemRoloDeCamera();
  
  
  
          File videoInputFile = new File(video.getSdcardPath());
  
  
  
          File videoFolderFile = videoInputFile.getParentFile();
  
  
  
          File videoOutputFile = new File(videoFolderFile, "video_comprimido_moymer.mp4");
  
  
  
          if (videoFolderFile.exists())
  
              android.util.Log.e("COMPRESS VIDEO UTILS", "video folder exist");
  
          else
  
              android.util.Log.e("COMPRESS VIDEO UTILS", "video folder DON'T exist");
  
  
  
          if (videoInputFile.exists())
  
              android.util.Log.e("COMPRESS VIDEO UTILS", "video input file exist");
  
          else
  
              android.util.Log.e("COMPRESS VIDEO UTILS", "video input file DON'T exist");
  
  
  
          if (videoOutputFile.exists())
  
              android.util.Log.e("COMPRESS VIDEO UTILS", "video output file exist");
  
          else
  
              android.util.Log.e("COMPRESS VIDEO UTILS", "video output file DON'T exist");
  
  
  
          FfmpegController ffmpegController;
  
  
  
          try {
  
  
  
              ffmpegController = new FfmpegController(context, videoFolderFile);
  
  
  
              Clip clipIn = new Clip(videoInputFile.getAbsolutePath());
  
  
  
              ffmpegController.getInfo(clipIn, new ShellUtils.ShellCallback() {
  
                  @Override
  
                  public void shellOut(String shellLine) {
  
                      videoInfo.add(shellLine);
  
                  }
  
  
  
                  @Override
  
                  public void processComplete(int exitValue) {
  
                      videoInfo.add(String.valueOf(exitValue));
  
                  }
  
              });
  
  
  
              int rotate = getRotateMetadata();
  
  
  
              Clip clipOut = new Clip(videoOutputFile.getAbsolutePath());
  
              clipOut.videoFps = "24";
  
              clipOut.videoBitrate = 512;
  
              clipOut.audioChannels = 1;
  
              clipOut.width = 640;
  
              clipOut.height = 352;
  
  
  
              if (rotate == 90)
  
                  clipOut.videoFilter = "transpose=1";
  
              else if (rotate == 180)
  
                  clipOut.videoFilter = "transpose=1,transpose=1";
  
              else if (rotate == 270)
  
                  clipOut.videoFilter = "transpose=1,transpose=1,transpose=1";
  
  
  
              millisDuration = getVideoDuration(videoInputFile.getAbsolutePath());
  
  
  
              float secondsDuration = millisDuration / 1000f;
  
  
  
              clipOut.duration = secondsDuration;
  
  
  
              ffmpegController.processVideo(clipIn, clipOut, true, new ShellUtils.ShellCallback() {
  
                  @Override
  
                  public void shellOut(String shellLine) {
  
  
  
                      android.util.Log.e("COMPRESS VIDEO UTILS", "shellOut - " + shellLine);
  
  
  
                      float percentage = getTimeMetadata(shellLine);
  
  
  
                      if (percentage >= 0f)
  
                          publishProgress(percentage);
  
  
  
                  }
  
  
  
                  @Override
  
                  public void processComplete(int exitValue) {
  
                      android.util.Log.e("COMPRESS VIDEO UTILS", "proccess complete - " + exitValue);
  
                  }
  
              });
  
  
  
  
  
          } catch (IOException e) {
  
              e.printStackTrace();
  
          } catch (Exception e) {
  
              e.printStackTrace();
  
          } finally {
  
  
  
              if (videoOutputFile.exists()) {
  
  
  
                  android.util.Log.e("COMPRESS VIDEO UTILS", "finished ffmpeg ---> video output file exist");
  
  
  
                  compressedVideo.setSdcardPath(videoOutputFile.getAbsolutePath());
  
  
  
                  return compressedVideo;
  
  
  
              } else
  
                  android.util.Log.e("COMPRESS VIDEO UTILS", "finished ffmpeg ---> video output file DON'T exist");
  
  
  
          }
  
  
  
          return compressedVideo;
  
  
  
      }
  
  
  
      private float getTimeMetadata(String shellLine) {
  
  
  
          float percentage = -1;
  
  
  
          if (shellLine.contains("time=")) {
  
  
  
              String[] timeLine = shellLine.split("=");
  
  
  
              String time = timeLine[5];
  
              time = time.replace("bitrate", "");
  
              time = time.trim();
  
  
  
  //            String source = "00:10:17";
  
              String[] tokens = time.split(":");
  
              int secondsToMs = (int) (Float.parseFloat(tokens[2]) * 1000);
  
              int minutesToMs = Integer.parseInt(tokens[1]) * 60000;
  
              int hoursToMs = Integer.parseInt(tokens[0]) * 3600000;
  
              long timeInMillis = secondsToMs + minutesToMs + hoursToMs;
  
  
  
              percentage = (timeInMillis * 100.0f) / millisDuration;
  
  
  
          }
  
  
  
          return percentage;
  
  
  
      }
  
  
  
      private int getRotateMetadata() {
  
  
  
          int rotate = 0;
  
  
  
          String durationString = "";
  
  
  
          for (String shellLine : videoInfo) {
  
  
  
              if (shellLine.contains("rotate")) {
  
  
  
                  //rotate          : 270
  
  
  
                  String[] rotateLine = shellLine.split(":");
  
  
  
                  rotate = Integer.parseInt(rotateLine[1].trim());
  
  
  
              }
  
  
  
          }
  
  
  
          return rotate;
  
  
  
      }
  
  
  
      public static long getVideoDuration(String videoPath) {
  
  
  
          MediaMetadataRetriever retriever = new MediaMetadataRetriever();
  
  
  
          retriever.setDataSource(videoPath);
  
  
  
          String time = retriever
  
                  .extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
  
  
  
          long timeInmillisec = Long.parseLong(time);
  
  
  
          return timeInmillisec;
  
  
  
      }

  The only change I made in the processVideo method was to add the following lines when building the commmand :

  cmd.add("-preset");
  
  cmd.add("ultrafast");